Screw-machine.



G. A RICH.

SCREW MACHINE.

APPLICATION FILED SEPT. 2. 1911.

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SCREW MACHINE.

APPLICATION FILED SEPT. 2, 1 13mm,

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0. 111011;. SCREW MACHINE.

APPLIUATION FILED SEPT. 2, 1911.

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15 fi mm Patented Mar. 9, 1915.

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G. A. HIGH.

SCREW MACHINE.

APPLICATION FILED SEPT. 2, 1911.

Patented Mar. 9, 1915.

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SCREW MACHINE.

APPLICATION FILED SEPT. P. m1.

Patented Mar. 9, 1915.

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HE Ki means earner venison- CHARLES A. RICH, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO BROWN 8: SHARPE MANUFACTURING COMPANY, OF PROVIDENCE, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

SCREW-MACHINE.

Specification of Letters Patent.

Patented Mar. 9, i915.

To (1U whom it may concern lie it known that I. Commas A. Bren, of the city and county of Providence and State of illhode lsland, have invented certain new and. useful lmprovements in Screw-Ma.- chincs; and I do hereby declare the following s 'ieciiication, taken in connectionwith the accompanying drawings, forming a part of the same, to be a full, clear, and exact de scription thereof.

The present invention relates to screw machines, and more es 'iecially to that class of screw machines in which a rod of stock is intermittently ted forward for the prescriliied distance to form an article and is held by the jaws of a revolving chuck and sure sively acted upon by a series of tools carried by an indexing turret-head. In certain machines of this class the series of tools are secured in a turrethead mounted on a turret-slide, and the reciprocating feed and return morei'nents are imparted to said turret-slide,;ivhich thus constitutes a feedslidc. in suchlmachines both the turret-slide and the turret-head mounted thereon, together with all of the tools secured in said turret- 'cd for separate head, are reciproca ted back and'i'orth in connection with the operation of each successive tool upon the work. A machine of this type is shown in the patent to Davenport,

X0. con-soc; dated May 1.7, we. In certain other machines the several tools are carried by a, series of tool-carriers which are mount- 7 and individual reciprocation in a turret-head which is mounted in stationary bearings. each t( ol-carrier being in turn connected with a reciprocating feedslidc. in such machines only the feed-slide with onc ot the tool-carriers connected therewith requires to be reciprocated for the feed and return movements. each tool-carrier beinn separately reciprocated, and only one of said carriers bei'i' reciprocated in connecon with each suct ive operation. A mane of this type is shown in the patent to iabriel. No. ThftiJSS, dated April, i, 1905.

t'crtain 'li-at urcs oi? the present invention are, ai uilicable to, and may be connection with, both types of machines above referred to.

The machine shown in the accompanying I drawings isespeciallydesigned as a high speed mac inc, and to that end the machine is of that type in which a series of individually reciprocating tool-spindles are ememployed in ployed, as machines of that type can be run at a much higher speed than machines in whlch a heavy turret-slide and the attached parts are required to be reciprocated in connection. with the operation of each successive tool. a

Certain further features of the invention therefore are more particularly applicable to, and adapted to be employed in connection with, machines embodying a series of individually reciprocating tool-carriers, and in whichthe turret has-simply a rotary movement imparted thereto for the purpos of indexing the same.

In both types of machines above referred to 1t is customary to employ separaterand independent mechanisms for imparting feed and return movements to the reciprocating feedslide, one of these mechanisms serving to impart to said slide a slow feeding movement, and the other mechanism serving to impart to said slide a quick return movement. In certain cases, as for example in the Davenport and Gabriel patents hereinbeforc referred to, the quick return mechanism is so constructed that it will also serve to move the tool or tools approximately up to the work at the same high rate of speed, leaving the slow running'mechanism to 0perate on] v to etl'ect the feed during the actual operation of the tools.

The primary object of the present invention is to provide a machine which may be run at a high speed, and in which the quick return movement of the toolcarrier Will be eiiected at a materially higher speed than has been heretofore, possible or practicable in machines of this class.

To that end the invention consists pri inarily in the employment, in combination with the main slide,-the turret slide in the one case or the feed-slide for individual tool-spindles in the other, ofan auxiliary or supplemental slide, and means whereby the quick return movements willbe im arted only to such auxiliary or supplementa slide, thereby avoiding the-necessity of imparting high speed movements to the heavy, or com-- paratively heavy, main slide, which is olejectionalole.

The invention further consists in the combination," with a series of individually movable toolcarriers. oi a main slide, an auxiliary slide adapted to be connected with sively, means for imparting quick return movements to said auxiliary slide, and a fixed stop for arresting the return or rearward movement of said auxiliary slide.

When the operating tool consists of a threading die it is usually necessary that there shall be a rearward movement of the feed-slide during the unthreading of the die. Such rearward movement cannot be eli'ectcd by the quick return mechanism, but must be effected or controlled by the feed-cam. In such case therefore the quick return mechanism must not begin to operate until after the die has cleared the worl At this time, however, a certain amount of return movement will already have been imparted to the feed-slide under the action or control of the feed-cam. Consequently when a fixed stop is employed for arresting the rearward movement of the feed-slide, the distance through which the feed-slide is to be moved by the quick return mechanism is correspondingly lessened.

A further feature of invention therefore consists in means for automatically breaking the connection between the quick return mechanism and the feed-slide, whereby the rearward movement of said feed-slide may be arrested before the return mechanism has completed its/ operative movement, and whereby said return mechanism may continue its operative movement after the rear ward movement of the feed-slide has been arrested.

The invention further consists in means whereby the feed-slide may be disconnected from the quick return mechanism in connection with setting up the machine, for example, and may be automatically connected with said quick return mechanism when the machine is again started.

, The invention further consists in the combination with a main slide and an auxiliary slide, of a feed cam therefor, a spring for imparting return movements to said auxiliary slide, and means for controlling the operation of said spring.

The invention further consists in the combination with a main slide and an auxiliary slide, of a feed-cam therefor, a spring for imparting return movements to said auxiliary slide, and means mounted on said main slide for controlling the operation of said spring.

The invention further consists in the combination with a main slide and an auxiliary slide, of a feed-cam therefor, a spring for imparting return movements to said auxiliary slide, means for controlling the operation of said spring, and means for positively returning said-auxiliary slide in case said spring fails to return'the same.

The invention further consists in the combination, with a main slide and an auxiliary .--:lidc-, of a feed-cam therefor, a tool-turret,

means for indexing said tool-turret, and means for returning said auxiliary slide to its rearward position before the indexing movement of said tool turret commences.

In the accompanying drawings, in which the features of invention are shown as embodied in a screw machine of that type in which the several tool-spindles are mounted for separate and individual reciprocation, Figure 1 is a front elevation of such machine. Fig. 2 is a rear elevation. Fig. 3 is an elevation of the right hand end of the machine partly in section and with certain of the parts omitted or broken away. Fig. l is a plan view of the turret mechanism. Fig. 5 is a front elevation of the return mechanism for the tool-spindles showing the parts in the position which they occupy when the auxiliary slide has been moved backward. by hand. Fig. 6 is a section on the line .rm of Fig. 1. Fig. 7 is a partial horizontal sectional view with the front and back shafts removed. Fig. 8 is a front elevation on an enlarged scale ofthe feed and return mechanisms for the tool-spindles, showing one of the tool-spindles in its forward'position. Fig. 9 is a corresponding front elevation of the feed and return mechanisms showing one of the tool-spindles in its rearward position, and with the parts in the position they occupy at the beginning of the indexing of the turret. Fig. 10 is a corresponding front elevation of the feed and return mechanisms, showing the parts in the position which they occupy at the end of the indexing operation and showing the next tool-spindle in series in its rearward position and ready to be fed forward. Figs. 11, 12 and 13 are detail views.

The machine shown in the drawings is a single spindle machine, that is, has a single work-spindle. The work-spindle end of the machine is or may be substantially like the machine shown in the patent to Davenport, No. (301,306, above referred to, and this part of the machine need be only generally described.

The work-spindle 1 is adapted to be rotated in opposite directions by. the two oppositely running pulleys 2 and 3 loosely mounted on said spindle and adapted to be alternately connected to the spindle in the usual manner by means of a clutch (not shown). 4 is the clutch-lever for opening and closing the jaws of the chuck carried by thework-spindle, said lever being operated by a earn 5 on the cam-shaft 6.' 7 is the feed-lever for operating the feed tube for feeding forward the rod of stock, said lever being operated by a cam 8' on said cam-shaft. Preferably means are provided for adjusting the leggth of the feed, such means being shown in ig. 2, and being the same as that shown and described in the Davenport patent referred to.

I 35 stock.

9 is the main driving shaft of the machine from which the cam-shaft and all the other parts of the machine, except the workspindle and the toorspindles, are operated.

The driving; pulley 10, instead of being-g mounted directly on the shaft 9, is preferably mounted on a. short shaft ll which is adapted to be connected to and disconnected from the driving shaft 9 by means of a 10 clutch 12. By the shifting of said clutch the operation of all those parts of the machine which are operated from the shaft 9 may be started or stopped.

Mounted on the shaft 9 is a sleeve 13 pro- 15 vided with a cam 1-L adapted to actuate the clutch-lerer 13, the movement of which in one direction on the other serves to connect one or the other of the pulleys '2 and 3 with construction shown in the drawings the cam ii is a single the work-spindle. In the acting cam and actua'tes the lever 15 to shift the clutch in one direction, said lever being operated to shift the clutch in the opposite direction by means of a spring-plunger 16 controlled as to its action by a transversely arranged lever ltl The camsleeve 13 is adapted to be connected to and disconnected from the shaft 9 by means of a clutch 17. the position of which is controlled by a transversely arranged lever 18.

As will be understood. the camshaft G is to be revolved a single revolution the proper time to-open and close the chuck-- jaws and to feed for 'ard a new length of For this purpose there is loosely mounted on the shaft 9 a two-part slewe, the two parts of said sleeve being rotatably but slidably connected together. The slid meshes with a gear (not shown) on the cainshaft 6. The member 19 of the'sleeve re ferred to is acted upon by a spring (not shown), and the movement of said member to engage and disengage the clutclrface 2O is controlled by a. transversely arranged lever 24.

Referring now to the tool-spi ulle end. of the machine, to which the present features of invention chietly relate, a series of separate and individually sliding t-ootspindles 25 are mounted in a turrot-l'iead which comprises two disks 26 and 27 mounted to revolve in housings and 29 and secured to a short shaft 30. Mounted to slide in ways 011 the frame ofthe machine a. slide 31,

which may be termed the main feed-slide; Mounted to slide in ways formed on said main slide is another slide 32, which maybe termed the auxiliary feed-slide. Each of as the tool-spindles 25 is adapted, when the ing member 19 of said sleeve is provided 1 0 with a clutch-face 20 adapted to engage a means of a series of keys 36 secured in the shaft 30 ivhich engage grooves formed in the split collars Ill). Formed on the inner surface of a segmental guide-ring 37 is a rib 3t)" filld 'ltttl to engage the grotn'cs 34: in the split collar said rib serving to hold the inactive tool-spindles in their retracted position and to euide said spindles during the indexing of the turret.

Referring now to the means for indexing the turret-head. there is loosely mounted on the shaft 9 on the opposite side of the collar 2i another two-part sleeve, the two parts of whichare rotatably but slidably connected together. 'ihtfsliding member 39 of said sleeve is provided with a clutch face it) adapted to engage a corresponding clutch-face on that side of the collar ill. upon by a sprii'itr (not shown) and the movement of said member is controlled by a transversely arranged lever -l-l. The other member iii of said sleeve is provided with a gear 43, which meshes with. .a. gear ll. secured to the shaftl?) mounted in hearings in the frame. viiecured to the shaft l5 isa crank-dish it; carrying a crank-pin 'l-T prefformed on one of the disks of the turrethead. As will be understood, the rotation of the cranlwlislt lii serves, by the euggruie ment of the crank-pin l? with one of the radial slots 45: in the dish it to give a par: tial rotation. to said dish and thus to the tlll'l'tft-llt.2l(l. it will also be understood that the slots in in the dish 1-!) are so arr-a1 ad that the cranl -piu will ienter and leave vnllil slots while moving: radially of the disk it), and that thus the turret will be cr minally started and stopped and may be indexed (prickly without any jar: either in starting or stopping. Preferably a locking pin (not shown) will he cinphrvcd l'or loclv'ing' the turret in indexed position at the end oi curb indexing .-peration.

Referring: next to the means for impart in; term l and return movements to the individual tool-s indlcs, the same embodies it slow running; feed-cam for advancing or feeding the tool-spindle during the operation of cutting, and ai'iother and quick act Plaid sliding member ii i is acted dle, said quick acting mechanism also prefierably serving to advance the tool-spindle to bring the tool up to the work. With such construction the tool-spindle is returned, the turret indexed, and the succeeding tool-spindle advanced to bring the next tool up to the work while the roll is passing over the high point of the feed-cam and passing low enough to bring it into proper position to feed forward said last mentioned tool-spindle duringthe cutting operation.

Referring first to the means for rotating the slow running feed-cam and for feeding forward such individual tool-spindles in cutting, the shaft 9 is provided at'its left hand end, Fig. 2, withthegear 53 which meshes with an intermediate gear 54 loosely mounted on a stud, which intermediate gear meshes with a gear 55 secured to a shaf? 56. The gears 53, 54, and 55 are pre erably change gears. The shaft 56 is provided with a worm 57 which engages-with a Worm-wheel 58 secured to one end of a transverse shaft 59. Secured to the shaft 59 is agear 60 (see Fig. 7) which meshes .Witha gear 61seeured to a parallel transverse shaft 62, on which last mentioned shaft issecured the slow running feed-cam 63. Said cam 63 is removable and, as will be understood,cams of varying shapes and with a varying number of lobes are to be employed, according to the character of the article to be produced and the number of tool-spindles to be used in the production of such article. In the drawings six tool-spindles are shown, and assuming that all of these spindles are to be employed in the production of a given article, the cam 63 will beprovided with a corresponding number of lobes, two only of which are for convenience shown in the drawings designated as 63 and 63', respectively. Mounted in suitable bearings in the frame is a rockshaft 64 provided with arms 65 and 66. The

' arm 65 is preferably provided with an antifriction roll 67 arranged to ride upon the periphery of the feed-cam 63. The arm or lever 66 is provided at its upper end with a gear-segment 68 which meshes with a, rack 6.9 secured to the main feed-slide .31.

Referring next to the quick acting mechanism for returning and subsequently advancing each individual tool-spindle, the shaft 45 is provided with an elongated gear 70 which meshes with a' gear 71 mounted to revolve on a stud72 secured on the main feed slide. Secured to the gear 71 is a bevel gear 73 which meshes with a bevel gear 74 secured. to a shaft 75. Secured to the shaft 75 is a crank-disk 76 carrying a cra1'-'.-pin

I seen, is mounted on the main feed-slide, is

77. Said crank-disk 76, which, as will be telescopic connecting rod 78, 79. One end of the part 78 of said connecting rod is pivotally connected to the crank-pin 77, while one end of the other part 79 of said connecting rod is pivotally connected to the auxiliary slide in the following manner Mounted to slide in the main feed-slide 31 is a block 80. Projecting from one side of said block is a pin 81 upon which the enlarged endof the part 79 of the two-part connecting rod is pivotally mounted. The auxiliary feed-slide 32 is provided with a downwardly extending bracket 82 in which is slidably mounted a spring-pressed pin 83, said pin being acted upon by-a spring 8% surrounding the same. Said spring 8 1 bears at one end against a shoulder 85 formed on the pin and at the other end against a plug 86 screwed into or otherwise secured to the bracket 82. The pin or projection 81 on the block is provided with a hole adapted to receive the inner end of the pin When the end of the pin 83 is, by the action of the spring 84 projected into the hole in the pin 81 the auxiliary feed-slide 32 and the block 80 are thereby connected together and said auxiliary feedslide is thus connected through the two-part connecting rod with the crank-disk 76 and with the main feedslide. When the pin 83 is withdrawn from engagement with the pin or projection 81 on the block 80 the auxiliary feed-slide 32 may be moved backward and returned to its normalposition by hand and independent of the block 80, which remains connected through the two-part connecting rod with the crank-disk. The pin 81 is cut away to form an annular shoulder 81 for a purpose to be hereinafter described.

The two parts 78 and 79 of the twoart connecting rod are normally connecte "or latched togetherby a latch in the form of a hook-lever 87 pivoted on the part 79, the hook of which lever is adapted to enter a notch 88 formed in the part 78 and to engage the wall of said notch, as shown in Fig. 8. A spring '89 is arranged to bear against the tail of said hook-lever 87, said spring acting to normally hold said lever or latch in en-- gaging position and thus to connect the two parts '78 and 79 of the connecting rod. The

purpose in making the connecting: rod 78, 79 in two parts .normally connected together is in order that by disconnecting. the two arts of said connecting rod the auxiliary cod-slide may be disconnected from the mainfeed-slide, and so that as the result of such disconnection the return movement of the auxiliary feed-slide may be arrested before the quick return mechanism carried by the main feed-slide has completed its oper ative movement. Secured to the frame is a cam 90 located in the path of a rojection 91 on the hook-lever 87 when sai hooklever is in the position which it occupies lie when the two parts of the connecting rod VVith the parts in this position, when the auxiliary feed-slide is moved back by the quick return mechanism, as hereinafter described, the projection 9.1 on the hook-lever 87 is thereby brought into engagement with the cam 90, which said cam, as the auxiliary feed-slide continues to move backward, acts to turn the hook-leve aboutits pivot, thereby with drawing the hook-end of said lever from the notch 88, thus disconnecting the two parts of the connecting rod and consequently disconnecting the auxiliary feedslide from the main fecdslide. Preferably the two parts of the connecting .rod are unlatched anddisconnected shortly before the auxiliary feed slide has reached its rearmost position, and so that the final rearward movement of said auxiliary fccd-slide is effected by the action of the spring 92 entirely" independent of the rotation of the crank-disk 76, said spring 92 serving, as will be more fully pointed out later, to move said" auxiliary. slide into engagement with a fixed abutment 32 and to hold said auxiliary slide against such fixed abutment during the operation of indexing. Preferably the arm or segment-lever (36 is provided with a projection (5(3 adapted to engage the fixed frame, as shown in Fig. 8 for a purpose to be hereafter referred to.

The spring 92 acts in effect upon the auxiliary feed-slide in the following manner: Said spring 92"is located partly in a-holc formed in the frame of the machine and partly in a hole formed in the block 80, one end of said spring abutting against the bottol'n of the hole in the fran'ic, and the other end abutting against the bottom-of the hole in said block. As said block is, as above described, normally connected with the auxiliary feed-slide, said spring 92 thus acts in ell ect upon said auxiliary feedslide. Preferably a second spring is employed which is adapted to act upon. the main feed-slide. A s 'iring pressed pin or plunger 93 acted upon by a spring 9i is mounted in the frame and arranged to bear against the arm or seginei'it-lever (50 and thus through said segn'nent-lever is adapted to act upon the main 'leedslide. As heretofore explained, the operation of the springplunger 16 and of the three several clutch members 17, 20, and -11 is controlled each by a transversely arranged lever, .ViZ., the lovers 16, 18, 24, and -11. The actuation of each of these four levers is controlled by tappets adjuslably lilOlITdtCttOll disks secured to the front shaft of the machine, all as more fully explained in the Davenport patent above referred to. i

For the purpose of facilitating the removal and replacement of the cams and 96, which operate the cross-slides of the n1achine, the front shaft referred to isprefer ably made in two parts E and 98, the two parts being; normally connected by a coupling: Oil and so that the part 98 will be.

rotated by the part 317. Secured to the shaft 59 is a bevel-{rear 1 .10 which meshes with a l)(,\('l Jf nl 101 on the part 97 of the front sha ft, and so that said front sha it is thereby rotated from the main driving: shaft 4?- through the train of nearing: leading there from to said shaft as), as above described. Secured to the part i)? of the front shaft are two disks 102 and 1 the disk 102 being provided with tappots 101 for actuating the lever -i'l and the dish 11). being); provided with tappets 105': for actuating the'lever 2i. Secured to the part 98 of the front shaft is another disk 106, provided on one side with tappets 107 for actuating the lever 18 and provided on the opposite side with tappets 1.08 for actuating the lever .112. in the case of some of the tools to be employed in a machine of this character it is desirable that the tool shall be rotated, as for example in the case of a srrevncutting: die or in the case of a. drill. Means are lheret'm'e provided for rotating one or more of the tools. In the construction illustrated means are shown for rotatin only one of the tools, but means may, if desired, be provided for rotating one or more additional tools. Each of the tool spindles 25 is hollow, and when provision is to be made for rotating a tool a rotary spindie is located within one of the hollow toolspimlles 253. Said rotary spindleis provided at its foi'u'a-nl end with a tool-holder 10$) (see Fig. 1) and provided at its rear end with a gear 111 which meshes with an elongated gear 111 rotalably connected with the pulley 112. Both the gcarlll and the pulley 1112 may be loosely mounted upon a stud 112-5 sccurml in a bracket 11-Cl attacl'ied to the frame. if desired, however, only the pulley may be mounted on this stud and the elongated gear 111 may be loosely mounted upon a prolongation of the shaft 30 of the turret head. the rotary spindle may be cl'ianged-by employing an intermediate eearadapte to be engaged by the ,gear 111 and in turn en gaging the gear 110.

If desired the direction of rotation of The operation of the machine above de-' tappets 105 on the lever 24, thereby causing 'sively upon the rod of stock, is as follows:

in Fig. 2 the clutch is in engagement with the reverse pulley 3, and that at the proper 5 time the clutch member 17 will be tripped and released by the action of one of the tappets 107 on the lever 18, thereby causing the cam 14 to be rotated and act upon the clutch-lever 15 to shift the clutch into engagement with the forwardly rotating pulley 2. It will also be understood that at the desired time the spring-plunger 16 will be tripped by the action of one of the tappets 108 on the lever 16, whereupon said springplunger. will act upon the clutch-lever 15 to shift the clutch into engagement with the reverse pulley 3. It will also be understood that when the rod of stock is to be fed forward the clutch member 20 will be tripped and released by the actionrof one of the the cam-shaft 6 to be rotated and by the rotation of the cams 5 and 8 causing the jaws of the chuckto be opened, the rod feeding devices to be operated and the chuck-jaws to be again closed upon the rod.

Understanding that a rod of stock is held in and rotated by the work-spindle, and that such rod'of stock is intermittently fed forward the desired distance for each article to be formed therefrom, the operation of that part of the machine which has to do with feeding forward and retracting the tools and with indexing the turret-head, whereby said tools are caused to act succes- As will be understood, with the construction shown and described, the several tools are advanced and retracted separately and individually, only the one tool which at the time is to act upon the rod of stock being thus advanced and retracted, while all of the other tools remain in their retracted position; Assuming now that the turret-head has been indexed and that one of the toolspindles 25 has been advanced by the quick acting mechanism up to the work, said toolspindle is then fed forward by the action of one of the lobes of the slow running feedcam, for example, the lobe 63, to cause the tool carried thereby to operate upon the work. This serves to bring the parts into the position shown in Fig. 8, wherein the tool- I spindle 25 therein shown is in its extreme forward position. At this time and with the 4 parts in this osition the clutch member 89 a-is tripped an released by the action of one of the tappets 104 on the lever 41, thereby causingthe. gears 43 and 44 and the shaft 45 to be rotated. The rotation of the shaft 45 serves through the connecting gearing to rotate the crank-disk 76, by means of which quick return and advancing movements are imparted to the auxiliary feed-slide.

In the present machine in which the sevand the tool-spindle at the time connected therewith are retracted by the quick return mechanism to their rearmost position, the turret-head is then indexed to bring the next tool-spindle into operative position and to connect the same with the auxiliary feedslide, and then said slide is advanced by the quick-acting mechanism to bring the tool in said spindle up to the work ready for said tool to be fed forward by the action of the feed-cam. While, therefore, the operation of indexing does not take place until after -the auxiliary feed-slide has been retracted,

it will be convenient to firstdescribe the operation of the indexing mechanism, and then to describe the operation of the quick-acting mechanism in retracting and advancing the auxiliary feed-slide. When the shaft 45 begins to rotate, the crank-pin 47 is in the position shown in Fig. 3. As the crank disk 46 is rotated, the crank-pin 47 is caused to enter one of the slots 48 in the disk 49, and so that the continued rotation of said crank-disk will cause the disk 49 to be rotated and thus, through the gears 51 and 52, causefthe turret-head to be indexed. The indexing movement of the turret-head will cause the block 33 on'the tool-spindle 25 to be carried out of engagement with the rib 35 on the auxiliary feed-slide and cause the corresponding block on the next tool-spindle to he brought into engagement with said rib, thereby connecting said last mentioned tool-spindle with the auxiliary feed-slide ready to be advanced thereby. It will be understood that during this indexing operation the auxiliary feed-slide will be held. in its rearward position against the abutment 32 by the action of the spring 92 on said slide. The rotation of the shaft 45, as above statedalso serves to rotate the, crankdisk 7 6. Assuming the parts to be in the position shown in Fig. 8, that is, with the auxiliary feed-slide in its extreme forward position and the tool connected therewith. having completed its operation upon the work, the rotation of the crank-disk 76 serves through the connecting rods 78, 79 to draw back the 'auxiliary feed-slide 32, or

more strictly permits said' slide to be meted.

bapli ard by the action of the spring 92 undei" the control of the rotating cra'inli' disk. it will be further noted that in the construction. shown. crcn alter the roll has passed by the high point of the cam, the main. slide will be prevented from being drawn forward by the rotation of the crank-disk 76 by the en ejageinent oi the projection 66" on the 80,11!I'lOllil'lGJOl' with the frame. Moreover, even it such projection were not present, the greater weight of the niain slide, as compared with that oi the auxiliary slide, in connection"withthe Spring-pressed plunger (l-l acting on the f:-GTl1i(3lli-l(%\'0l, would serve to prevent tl'orward movement of the main slide and insure that only rearward movement of the auxiliary slide will be produced by the rotation of the cranlcdisk a this time.

As the auxiliary slide is moved backward by the action of the spring 92 under the control of the crank-disl-l 7e, and just before said slide-reaches its rearinost position, the Pl'UjUCi lOll ti] on the hoolelerer S7 is brought into engagement with the fixed cam S)(l,thcreby turning: said hookderer about its pivot so as to withdraw the hook of said lever from the notch 89., thus disconnecting the two parts oi' the connecting rod. and consequently diseonnectinnthe auxiliary teed-slide from the main slide. llhcn the parts have been thus (llSCflllllOi'tiWl the spring 9% acts to complete the reaiward nioiij-incnt ot' the auxiliary slide and to more the same against the fixed abutment hi3"; against which abi'itincnt, as above stated. the auxiliary slide is held by said spring during the indexing; operation. As the crank-disk 'iil continues to rotate it will serve to more the part 78 oi the con-- nccting rod with relation to the part 79, i'ur'.

ther movement of said part (i being pre rented by the engagement oi the auxiliary slide with the .iixed abutment. until the parts are brought into the position shown in Fig. which is the position they occupy at the time the indexing oi the turret-heiul begins. The indexing operation then takes place, the auxiliary sl'de re 'nainii'ig stationary against the fixed abutment during such indexing operation. During: the operation of indexing the crank-disk 76 is moved from the position shown in Fig. 9 to the position shown in Fig. 10. With the fGCfl'CMH 3 "formed as shown in the drawings the main feed-slide wilhat this time. by ihe action of the sprinpgprcssed plunger 93 on the. se i'nent-lever, have been moved back\ ard 'lron'i the position shown in Fig. 9 to the position shown. in Fig. 10, such back\ 'a rd movement of the main slide being permitted by the shape of the feedeain 63,

whereby the roll (57 has been caused to pass down to the low point 01 the earn, as shown, in 10. By reason of such backward movement of the main slide the crank-disk 76 carried thereby, together with the part .to the work.

78 of the connecting red, are likewise darried backward to the same extent, thereby bringing the parts into the position sholwn inlhig. 1i). It will be understood that with the parts in this position the indexing of the i turret-head has been completed.

rod and the advancing movement of the auxiliary slide by the quick-acting mocha nisin to bringythe tool carried by the toolspindle now connected with said slide up As will be understood, the i.

crank-disk Ti; continues to be rotated until the eranlit-pin T7 is moved from the position shown in F i. 1.0 to the position shown in Fig. 8, that is, to the position which 1t 00- cupicd when said cranledisk began its ro-' tation. Such continued rotation of the cranledisk serves to more the part 78 of the connecting rod with relation to the part 7 9 until the forward end of the part 78 is caused to abut against the shoulder on the.

part T9, when both parts are by the c0ntinned rotation of the crank-disk moved forward ti'igethen thereby imparting quick advancing movement to the auxiliary slide to bring the tool carried thereby up to the work. As the auxiliary slide is thus moved forward the projection 91 on the hook-lever rides otl' of the cam 90. whereupon said hook-lever is rocked by the action of the spring 89 to cause its book to again enter the notch 88 and thereby reconnect the two parts of the connecting rod and again connect the auxiliary slide to the main slide, and so that as the main slide is again advanced by the action ot: the next lobe of the teed-can], the tool carried by the spindle then connected with the auxiliary slide will be ted along the work. As will be understood, the drop on the feed-cam will vary in the ease of different lobes, being in some cases a long drop. as in the case ofthe lobe ezn in the. drawings, and being in other cases a short drop, as in the case of the lobe 63. As will be seen, when the drop is a short one the main slide will not. when it passes .the hig'h point of the cam, be moved as for backward by the action of the springpressed plunger as where the drop is a long one. .Tn such case, therefore, the end of the part 78 of the connecting rod will not be moved as ta r away from the shoulder on the part 79 as is shown in Fig. 10, and conseqnently. the end oi said part 79 will, by the continued rotation of the cranlcdisk 76 be brought into engagement with the shoulder on the part 79 correspondingly earlier, and so that a greater extent of advancing movement will in such case be imparted to the auxiliary slide by ,the quick-acting crankdisk. When a screw-thread is to be cut on the work the die must be run off of the work before the quick-return mechanism begins to operate. In such case, therefore, released, the inner end of said pin will bring the proper tappet 104 is so .-.adjusted that up against and will ride along the outer face the-"clutch-member 4.0 will not be tripped of the part 78 of the connecting rod. When and theshaft 45, therefore, will not be ro -now the crank disk 76 is rotated with the tated until the die has cleared the Work. parts in this position the rotation of said fDuring the. running off of the die, therefore, crank-disk will act to move the block 80 the ,auxiliary slide and the main slide, which rearward until the hole in the projection 81 arefat this time connected, are moved back comes in line with the pin 83, when said pin togethe'runder the conjoint action of the will, under the action of its spring, be 7, spring 92 and the spring-plunger 93 under snapped into said hole and the parts be thecontrol of the feed-cam, the drop of the thereby automatically reconnected. It will proper lobe on said cam being formed 'to be noted that the annular shoulder 81 on correspond to the pitch of the thread cut the projection 81 will, as the block is thus and thus to the movement of the die in moved rearward, come in contact with the running oif. It may be noted that either end of the pin 83,-thereby preventing the 30 one of the springs'referred to would serve hole in the projection 81 from passing by to effect Such backward movement of t e the pin and causing the pin to enter said slide, but in the construction shown both hole. Preferably the spring 84 is so wound springs cooperate in the production of this that upon the withdrawal of the pin 83. the result. When the d e has Cleared the ork coils of the spring will come together when 85 the clutch member 40 is tripped, ther by said pin has been withdrawn sufficiently to starting the rotation, through the shaft 45, clear the cut-away portion of the end of the ,of boththe indexing crank-disk 49 and the projection 81. With this construction, as crank-d1sk 76. This serves to start the op will be seen, the annular shoulder 81' will oration ofthe inde ing mechanism d 3150 also serve to prevent the auxiliary slide the operation of the q i k return m from being moved forward of its connected nism, Which latter W t n a to Cause position and will thus prevent the pin 83 the auxiliary slide to be moved With rehifrom being moved on to the forward side of tiontp the main slide until the two parts of th projection 81. the connecting rod have been d sco e \Vith the construction above described, as and until the auxiliary Slide r g P will be seen, the quick return and advancing Etgtll'lSt fixed abutment, the operation novements are not imparted to thgiheavy after, the die clears the work being the s main feed-slide, but are instead imparted as herelnbefore described only to the auxiliary feed-slide, which is Itv may often be desll'ab e, a In settlng up much lighter in weight, and as these quick the machine or otherwise, to index the turmovements are thus imparted only to this rot-head by hand, or to move the auxiliary relatively light part, the speed of these feed-Slide to its ea wa po i ion by hand movements may be materially increased with for some other purpose, and this is made a corresponding saving of time and increase possible by the construc l n shown. By in production. Moreover by the employwithdrawing the spring-pressed pin 83 from inent of separate and indivi ually movable engagement with the pin O IOjeCtiO I 81 tool-spindles, only one of which requires to on the block 80 the auxiliary eed-slide will be reciprocated with the auxiliary slide at be thereby disconnected from the crank-disk any one time, the turret-head itself having 76, although the block 80 will remain conno longitudinal movement, the total weight nected therewith. Consequently the auxto be retractedand advanced by the quickiliary side will be free to be moved backacting mechanism is limited to the weight of I ward to any desired position, as for examthe auxiliary slide plus the weightof a sinple to its extreme rearward position, as gle tool-spindle, thereby making possible a shownin Fig. 5; and so that the turret may, still further increase of speed. ifdesired, be then indexed by hand, and the \Vhen separate individually movable toolauxiliary slide then returned'to its normal spindles are employed in an indexing turposition and reconnected with the block 80 ret-head it is desirable that each spindle and the crank disk '76. Inasmuch as it shall in turn be retracted to the same defimight happen that the operator, after thus nite position in order that when the turret- 12o disconnecting the auxiliary slide and movhead is indexed the next tool-spindle will ing it backward, might forget to return said be certain to be engaged with the actuating slide to its normal position and reconnect device. Consequently it is desirable in the thesame with the block 80, means are propresent machine that the auxiliary feedvided whereby, if this shouldhappen, said slide should always be brought back to the slide will, when the crank-disk 7 6 is next ro same definite position at each reciprocation tated, be automaticallyreconnected with said thereof, and it is for this reason that the block. Thus when the pin 83 is pulled out fixed abutment for said slide is provided. ofthe liole inthe projection 81, the aux- When such fixed abutment is employed it il-iary slide moved backward, and the pin might happen that the auxiliary slide would 13o bring up against such abutment before the crank-disk 76 had completed its throivof 180. If this should happen the result would be that after the auxiliary slide had brought up against its abutment the further rotation of the cranlndisk would serve to impart a forward movementto the main slide. This would result in the quick movemcnt of a heavy part, which would be objectionable. Moreover, if the main slide were thus moved forward it might serve to move theroll 7 out of engagement with the feedcam and entirely away therefrom, and so that when said roll were again moved toward the feed-cam by the further rotation of the crank-disk. it would be brought into contact with said cam at a high speed and 'thus with conside'able force,- causing a shock and jar to the machine, which would be further objectionable. By )roviding means for disconnecting the auxiliary slide from the crank-disk at or before the time said auxiliary slide brings up against its abutment, said cranle'disk may rotate through its further throw Without impait' ing any movement either to the auxiliary slide or to the main slide. Moreover, providing means for thus disconnecting the auxiliary slide from the crank-disk and thus from the main slide, said auxiliary slide is thereby released from any action of the crank-disk, and so that said auxiliary slide will thus not only be brought back to the same definite position at each FCClPI'OCH E-IOH, but may be held in that position throughout the indexing operation. In other words, the provision of thus disconnecting the auxiliarv slide makes possible and brings about a dwell of the auxiliary slide in its rearward position during the time the turret-head is being indexed.

it may be noted that by providing the pr jcotion 66 on the segment-lever toabut against the Frame, whereby the main slide is prevented from being pulled forwardwhen he crank-disk 76 is rotated, the rotation or said crank-disk will serve to bring about the quick return of the auxiliary slide, even if the spring 92 should be absent or fail to operate. Thus ii, as may sometunes happen, a tool should stick on the work, and that the spring 92 was insui'hcicnt to Withdraw the tool from the work, the rotation oi the crank-disk would serve, by-reason of the engagement of the projection 66* with the frame, to positively withdraw the tool clear of the Work, when the spring 92, is present,

would serve to complete the return movementof the auxiliary slidennder the control of the crank-disk.

While the machine shown and described is of that type in which the several toolsare mounted in individually movable spindles, each of Which is separately advanced and. retracted, the underlying feature of invention, which consists in the comiolnation, with a. main slide, of an auxiliary slide, and means for giving quick return movements only to said auxiliary slide, may be employed in other types oi machines.

It will be understood that While the machine is especially adapted for making metal screws and is commonly reterred' to as a screw machine, said machine is also adapted tor making a great variety of other articles, and where the term screw machine is employed in the specification. and claims such term is employed to designate the general character of the machine and without reference to the particular articles made thereby.

What l claim as my invention and desire to secure by Letters .latcnt is:

l. A. screw machine having in combination a. main slide, a tool carrying auxiliary sli is mounted on said. main slide, and means for imparting a quick return movei'nent to said auxiliary slide.

2. A, screw machine having in combination a main slide, a tool carrying auxiliary slide mounted on said main slide, means for advancing said auxiliary slide, and means for imparting a. quick return movement to said auxiliary slide.

A. screw machine having in combination a main slide, a tool carrying auxiliary slide mounted on said main slide, means for advancing both of said slides, and means for mnfiarting a quick return movement to said auxiliary slide.

l. A screw machine having in combination a main slide, a tool carrying auxiliary slide mounted on said main slide, and means mounted upon said main slide adapted. to effect a quick return movement of said aux- 'iliary slide.

A screw machine having in comhination a main slide, an auxiliary slide, means for advancing said slides, a spring acting upon said auxiliary slide tending to return the same, and means for controlling the ac tion of said spring.

A screw machine having in combination amain slide, an auxiliary slide, means for advancing said slides, a spring acting upon said auxiliary slide tending to return the same, and means mounted upon said main slide for controllingthe action of said spring. 1 i

7. A screw machine having in combination a main slide, an auxiliary slide, mechanisin connecting said slides, and means for causingsaid connecting mechanism to impart movement to said auxiliary slide While the main slide remains stationary.

8. A screw machinehaving in combina tion a main slide, an auxiliary slide, a crank connection between said slides, and means for causing said crank connection to impart movement to said auxiliary slide While the main slide remains stationary.

v. A screw machine having in combination a main slide, an auxiliary slide, means .for' advancing said slides, and means for returning said auxiliary slide independent of said main slide. V

10 A screw machine having in combina of said auxiliary slide independent of said main slide. I Y r 11. A screw machine having in combinas gma main slide, an auxiliary slide, a'cam for advancing sa d sl1des,- and means for 'return.ing said auxiliary slide independent of said main slide.

12. A screw machine having in combina tion amain slide, an auxiliaryslide, a cam for advancing said slldes, and means carried by said main slide adapted to effect a return ,3016 said auxiliary slide independent of said main slide. I

13. A screw machine having 1n combmation a main, slide, an auxiliary slide, a tur--.

ret-head, means for. indexing said turrethead, means for advancingisaid slides,v and 1' means operating n connection with said 111- dexing mechanism-for returningsaid auxil iary slide. e

tlnuously slides, and intermittently operating means for returning said auxiliary slide. I

l5. Ascrew machine having in combination a main slide, an auxiliary slide, a continuously slides, carried by said main slide for returning said auxiliary slide. 1

.16. A screw machine having in' combinar tion a main slide, an auxiliary slide, means for advancing said slides, a turret-head, means for indexing said turret-head, and means carried by said main slide and operating in connection with said indexing mechanism for returning said auxiliary slide. g

17 A screw machine having in combination a main slide, an auxiliary slide, means fon advancingsaid slides, a turret-head, means for indexing said turret-head, and

7 means carried by said main 'slideand' opcrating in' connection with said indexing mechanism for returning 'said auxiliary slide.

18. A screw machine having in combiner M tion a main slide, an auxiliary Slide, a cam for advancing said slides, a turret-head, means for ilnplexing said turret-head, and means opera rug in'connection with said in dexing mechanism 'for returning said auxiliary slide. a 19. A screw machine having in combinamoying cam for advancing-saidand intermittently operating means.

'tion a main slide, an auxiliary slide detachtion a main slide, an'au-xiliary slide detachably connected to said main slide, and means for automatically disconnecting said auxiliary slide from said main slide and recon- .nectin the same therewith. ..22. screw machine having in combination a main'slide, an auxiliary slide detachably connected-to said main slide, a spring for returning said auxiliary slide, means fon controlling the operation of said spring, and means for disconnecting said auxiliary slide from said main slide 23. A screw machinehavingin combination a? main slide, an auxiliary slide detachably connected to said main slide, a spring orl'returning said auxiliary slide, means for controlling-the operation of said spring, ,means for disconnecting said auxiliary slide I 'from-saidmain slide, and a stop for arrest- 14. A screw machine having in combinetion a main slide, an auxiliary slide, a con moving cam for advancing .said

the return movement of said auxiliary se..--'.-"..

" 24.- A screw'machine having in combination a main slide, an-auxiliary slide detachably connected to said main slide, a spring for returning said auxiliary slide, means carried'by said main slide for controlling the operation of said spring, means for dis- .con necting said auxiliary slide from said ma1n-slide, and a stop for arresting the returnmovement of said auxiliary slide'.-'

25. A screw machine having in combination a main slide, an auxiliary slide, a spring for returning said auxiliary slide, and means forcontrolling the operation of said spring and adapted toefiect the ret rn movement .of said auxi1iary -slide if said spring fails to operate.

26. A- screw machine having in combination..a main slide, an auxiliary slide, quick return'mechanism for returning said auxiliary slide independent of said main slide, and meansfor controlling the operation of said quick. return mechanism.

- 27. A'screw machine'having in combination a main slide, an auxiliary slide, a cam for advancingsaid slides, means for pertially returning both'of said slides under the control of said cam, and quick return mechanism for completing the return movement of said auxiliary slide independent of said main slide.

28. A screw machine having in combination a mainslide, an auxiliary slide mounted on said main slide, a tool carrier, and means whereby said tool-carrier may be connected with and disconnected from said auxiliary slide.

29. A screw machine having in combination a main slide, an auxiliary slide mounted on said main slide, a series of tool carriers dexing said turret-head, and means for con necting said tool-carriersisuccessively with said auxiliary slide. f

31. A screw machine having in combmation a main slide, an auxiliary slide mounted on said main slide, a tool-carrier, means whereby said tool carrier may be connected with and disconnected from said auxiliary slide, and means for imparting a return movement to said auxiliary slide independent of said main slide.

32. A screw machine having in combination a main slide, an auxiliary slide mounted on saidmain slide, a tool-carrier, means whereby said tool carrier may be connected with and disconnected froriisaid auxiliary slide, and means for imparting a quick return movement to said auxiliary slide.

33. A screw machine having in combination a mainslide, an auxiliary, slide mounted on said main slide, a series of tool-carriers, means whereby said tool carrier may be separately connected to and disconnected from said auxiliary slide, and means for imparting a quick return movement to said auxiliary slide.

34. A screw machinehaving in comhination a main slide, an auxiliary slide mounted on said main slide, a turret-head provided with a series of tool-carriers, means for indexing said turret-head, means for connecting said toolcarriers successively with said auxiliary slide, and meansfor imparting a quick return movement to said auxiliary slide.

A screw machine having in combina tion a main slide, a tool carrying auxiliary slide mounted on said main slide, means for imparting a quick return movement to said auxiliary slide, and means for causing a dwell of said auxiliary slide in its rearward position.

36. A screw machine having in combina tion a main slide, a tool carrying auxiliary slide mounted on said main slide, means for imparting a quick return movement to said auxiliary slide, means for causing a dwell of said auxiliary slide in its rearward position, a turret-head, and means for indexing said turret-head during the dwell of said auxiliary slide.

hit

37. A screw machine having in combination a main slide. an auxiliary slide detachably connected to said main slide, means for imparting a quick return movement to said auxiliary slide, means for disconnecting said auxiliary slide from said main slide, and a stop for arresting the return movement of said auxiliary slide.

38. A screw machine having in combination a main slide, an auxiliary slide detachahly connected to said main slide, means for disconnecting said auxiliary slide from said main slide, a stop for arresting the return. movement of said auxiliary slide, andmeans for imparting a quick return movement to said auxiliary slide and holding said slide against said stop upon the completion of its return movement.

39. A screw machine having in combination a main slide, a tool carrying auxiliary slide mounted on said main slide, means for imparting a quick return movement to said auxiliary slide, means for causing a dwell of said auxiliary slide in its rearward position, and means for imparting a quick advancing movement to said auxiliary slide.

40. A screw machine having in combination a main slide, a tool carrying auxiliary slide mounted on said main slide, means for imparting a quick return movement to said auxiliary slide, means for causing a dwell of said auxiliary slide in its rearward position, a turret-head, means for indexing said tur ret-hea'd during the dwell of said auxiliary slide, and means for imparting a quick advancing movement to said auxiliary slide.

41. A screw machine having in combination a main slide, a tool carrying auxiliary slide mounted on said main slide, means for advancing said slides, a turret-head, means for indexing said turret-head, and means for effecting the return movement oi said auxiliary slide in advance of the indexing oi said turret-head.

4-2. A screw machine having in combination a main slide, a tool carrying auxiliary slide mounted on.said main slide, means for advancing said slides, a turret-head, means for indexing said turret-head, means for effecting a quick return movement of said auxiliary slide in advance of the indexing of said. turret-head, and means for causing a dwell of said auxiliary slide in its rearward position at the time of indexing said turret-head.

43. A screw machine havmg 1n eombination, a main slide, a tool carrying auxiliary slide, a crank connection detachably connecting said. slides, and means for operating said crank connection. to impart a quick returnmovement to said auxiliary slide.

44:. A screw machine having in combination a main slide, an auxiliary slide, a crank connection detachably connecting said slides,

connection dctachably connecting said slide,

means for operating said crank connection to impart a quick return movement to said auxiliary slide, means forldisconnecting said crank connection, and means for reconnecting the same.

'46. A screw machine having in combination a main slide, an auxiliary slide, a spring acting on said auxiliary slide for imparting .a quick return movement thereto, a crank connection detachably connecting said slides for controlling the action of said spring, and means for disconnecting said crank connection; y 47, A screw-machine having in combination'a main slide, an auxiliary slide, a spring acting'on said auxiliary slide, for imparting slide to impart return movement thereto for advancing said-slides, a spring acting on said auxiliary slideto impart a quick return movement thereto,- a crank connection between said slides for controlling the action of said spring, means for controllin the operation of said crank connection, an a second spring acting on said mainslide to impart return movement thereto under the control of said cam.

53. A screw machine having in combina tiona main slide, an auxiliary slide detacha quick. return movement thereto, a crankflably connected thereto, and means for disconnection detachably' connecting said slides for controlling the action of said spring, means for disconnecting said crank connection, and means for-reconnecting the same.

48. A screw machine having in combina tion a main slide, an auxiliary slide, a cam for advancing said slides, and means for imparting a quick return movement to said auxiliary slide independent of the main between said slides for controllingthe acslide, the return movement of the main slide being controlled by saidcam.

'49. A screw machine having in combination a main slide, an auxiliary slide, steam for advancingsaid slides, a spring acting on said auxiliary slide to impart a quick return movement thereto, a crank connection tion'of said spring, and a second spring actmg on; said main slide to impart return tion a mainslide, an auxiliary slide, a cam movement thereto under the control of said cam, -50. A screw machine having in combinafori advancing said slide, a spring acting on saidauxiliary slide to impart a quick return movement thereto, a crank connection detachably connecting said slides for controlling the action of said spring, means for disconnectingsaid -crank connection, and asecond spring act ng on said mam connection embodying a mova connecting said auxiliary slide from said.

main slide, whereby said auxiliary slide may be moved by hand independent of the main slide.

54. A screw machine having in' combination a main slide, an auxiliary slide detach- I ably connected thereto, means for disconnecting said auxiliary slide from said main slide, and means for causing said parts to be automatically reconnected.

55. A screw machine having in combination a main slide, an auxiliary slide, a crank connection between said slides, said crank connection embodying a movable member by the movement of which said slides may be disconnected and said auxiliary slide be' moved by hand independent of said main slide.

56. A screw machine having in combination a main slide, an auxiliary slide, a'cranksaid crank le member, and .means whereby the rotation of the crank will cause said cally reconnected.

connection between, said slidesi) cnannns A. n ce.

Witnesses: W. H. Tnuns'roiv, J. H. THUBSTON.

parts to be automati- 

